PASS Week 10: Strings

WARMUP (Review from Last Week): Take String as Input

Create a program that will take the user's first name as input and stores it as a string.
Then print the string back to the screen as output.

SAMPLE OUTPUT:

Enter in your first name: Justin
The name you entered: Justin









Mystery Program:

Decipher what this program is doing.


#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int p1(int, int, int);

int main()
{
    int num1, num2, num3;

    scanf("%d %d %d", &num1, &num2, &num3);

    p1(num1, num2, num3);

    return 0;
}

int p1(int n3, int n2, int n1){
    int ary[n3];
    srand(time(NULL));
    int ff = 0;

    for(int i = 0; i < n3; i++){
        ary[i] = rand() % n2;
    }

    for(int i = 0; i < n3; i++){
        if(ary[i] < n1){
            ff++;
        }
    }

   printf("%d\n%d\n%d\n", n1, n2, n3);

    for(int i = 0; i < n3; i++){
        printf("%d ", ary[i]);
    }
    printf("\n");

    return ff;
}














PROBLEM #1: Taking Multiple Strings and Data as Input

Similar to problem 1, create a program that will prompt the user to enter their first name, last name, and age. However, you must take all 3 inputs IN A SINGLE scanf statement. Then print them back out to the user.
First name will be stored in a string, last name will be stored in a second string, and age is an integer.

SAMPLE OUTPUT:

Enter in your first name, last name, and age:
Justin Bentley 21
Hello Justin Bentley age 21












PROBLEM #2: Using fgets(), Strings and String Functions

Compose a program that prompts the user to enter 3 separate sentences and stores them in 3 separate strings (Each character array will be 40 in length). Then copy/concatenate all 3 sentences into one huge string of length 120.

Prompt the user and use fgets() to read the input into the first array.
Then prompt the user for a second sentence and store it in the second array.
Then do the same again storing a third string into a third array.

Next, use the strcpy() function to copy the first array into the fourth array.
Then use the strcat() function to concatenate the second array onto the end of the fourth array. Then do it again, concatenating the third array into the fourth array.
Then print the fourth array using the %s modifier, and the length using strlen().

SAMPLE OUTPUT:

Enter in your first name: Justin
Enter in your middle name: William
Enter in your last name: Bentley
Justin
William
Bentley
23















PROBLEM #3: String Reversals

Create a program that will reverse a string
Declare and initialize a string with the value "Raisin Bran isn't bad".
Then use a loop and the strlen() function and print the string one character at a time backwards.

SAMPLE OUTPUT:

dab t'nsi narB nisiaR













PROBLEM #4: Converting Strings to Uppercase

Compose a program with a character array of 81 characters in size. Also declare
an integer variable to store the size of the sentence later on.

Prompt the user to enter in a sentence up to 80 characters and then store it in the array using fgets().
Get the sizeof() the sentence, and store it in the integer you made earlier.

Now, using a for loop, examine the stored sentence one character at a time check if they are uppercase using the isupper() function. If it ISN'T uppercase, then make it uppercase using the toupper() functin.
Also, remove the carriage return ‘\n’ character from the array if you use fgets() to get the input string.

Finally, print out the new string using printf.

SAMPLE OUTPUT:

Enter in a sentence: This is a sentence
THIS IS A SENTENCE













PROBLEM #5: Counting Specific Characters in a String

Re-using your solution to problem #4, modify the program to read in a sentence up to 80
characters but this time count the number characters that are not spaces, periods,
exclamation points or commas.

Print out the total and this should be the number of characters that weren't specified.

SAMPLE OUTPUT:

Enter in a sentence: This is a sentence
Total: 15